| http://www.w3.org/ns/prov#value | - Such microemulsions are described in British Patent Specification No. 2,190,681 and in U.S. Pat. Nos. 5,075,026; 5,076,954 and 5,082,584 and 5,108,643, most of which relate to acidic microemulsions useful for cleaning hard surfaced items, such as bathtubs and sinks which microemulsions are especially effective in removing soap scum and lime scale from them.
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